I was asked for more details regarding the blocks I made for this quilt.
The corner triangles were 3 inch squares cut once on the diagonal.
After piecing the block, I trimmed it up to 12 inches for a finished size of 11 1/2 inches. Some patterns/tutorials for this block have you use squares or rectangles along the edge and then trim them off when squaring up the block. This gives bias edges to your blocks, something I loathe. Bias edges can be eased to fit, but they are unstable. They can easily be stretched out of square, especially when long arm quilting.
And if I may go on a bit of a tangent here….. I really dislike the method of making half square triangles in which you take two squares, sew around the edges, and then cut diagonally twice to give you four half square triangle blocks. This method is used in many Missouri Star tutorials. It is a clever use of fabric, but those bias edges! Ugh! It takes a careful, skilled quilter to properly add borders to a top that has all bias edges. More often than not, wavy borders are the result. As a long armer, wavy borders can be a real pain in the back side. Also, the tension on the quilt top in the frame can make it easy to pull those blocks out of square.
Your mileage may vary. I know many of you love this method. This is just my opinion. I have much better success when the edges of my blocks are all on grain.
Have a great day!